DS868PP2

Copyright 2008 Cirrus Logic, Inc.

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CS49DV8C Data Sheet

32-bit Audio DSP Family

4.3 DSP I/O Description

4.3.1 Multiplexed Pins

Many of the CS49DV8C pins are multi-functional. For details on pin functionality please refer to the

CS4953xx Hardware User’s Manual.

4.3.2 Termination Requirements

Open-drain pins on the CS49DV8C must be pulled high for proper operation. Please refer to the

CS4953xx Hardware User’s Manual to identify which pins are open-drain and what value of pull-up

resistor is required for proper operation.

Mode select pins on the CS49DV8C are used to select the boot mode upon the rising edge of reset. A

detailed explanation of termination requirements for each communication mode select pin can be found

in the CS4953xx Hardware User’s Manual.

4.3.3 Pads

The CS49DV8C I/O operates from the 3.3 V supply and is 5 V tolerant.

4.4 Application Code Security

The external program code may be encrypted by the programmer to protect any intellectual property it

may contain. A secret, customer-specific key is used to encrypt the program code that is to be stored

external to the device.